Why Bill Goldberg isn't a Hall Of Famer?

I read that HHH and Shawn Michaels said that to be in Hall Of Fame you must wrestle for a lot of years and Goldberg wasn't fighting for a lot of time but we must not forget his undefeated streak and how the fans loved him. So do you believe if he is ever going to be inducted to the Hall Of Fame and why isn't he already in? Also why the WWE didn't renew his contract?